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Fair Value Measurement - Roll Forward for Financial Assets and Liabilities Measured at Fair Value Using Significant Other Observable Inputs (Level 2) (Detail) (Fair Value, Measurements [Member], USD $)	3 Months Ended
	Mar. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable debt securities, Ending Balance	$ 26,032,328
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable debt securities, Ending Balance
Significant Other Observable Inputs (Level 2) [Member] | Bond obligation [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable debt securities, Beginning Balance	125,000
Fair Value Measurement With Unobservable inputs reconciliation recurring basis asset transfers into level 1
Financial liabilities change included in earning fair value disclosure
Financial liabilities change settled in earning fair value disclosure	(53,750)
Marketable debt securities, Ending Balance	$ 71,250

X

- Definition

Fair Value Measurement With Directly Or Indirectly Observable Inputs Reconciliation Recurring Basis Liability Gain Loss Included In Earnings

+ References

No definition available.

+ Details

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X

- Definition

Fair Value Measurement With Directly Or Indirectly Observable Inputs Reconciliation Recurring Basis Liability Settlements

+ References

No definition available.

+ Details

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X

- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

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X

- Definition

Amount of transfers of assets measured on a recurring basis out of Level 2 of the fair value hierarchy into Level 1.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (bb)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

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